After desoldering connectors away I soldered these wires as shown here.

SIM card slot... All working... Surf is up!

Questions? Comments?

This mod works on any eee pc without the extra pcie slot. ( so it's not good for 8G models ( pcie slot has that 8g ssd drive ) and not as easy on first 4g models with pcie connector in place ( you would need to cut 20 mm of from the pcb to make it fit) )

I just wanted to let you know that i think you are doing some great mods! They seem to be just a bit over my head (i've got it all down but the soldering) but I love to continue reading about you pushing the eee to its full potential.

I wanted to know JKK Have you ever tried to install a HSDPA in to a Q1U to see if the Sim card slot worked. i went to bestbuys yesterday and feel in love. I'm trying to wait tell after CES to buy a UMPC. I saw your Right up on the Advantage and went and got one but its just not enought for me i need more so if you can Please test

I know the easiest way to use an antenna would be to use the built in wifi (2400mhz) antenna, BUT it's for the wrong frequency range. Wireless broadband cards operate in the 800, 900, 1800, 1900 and 2100mhz bands. With my limited knowledge of amateur radio and antenna building skills, it tells me that your wifi antenna is too short and could cause problems now and in the future such as reduced transmit and receive signal strength and burning up the output transistors on the card because of too high vswr on the antenna (reflected power back to the transmitter from the antenna because it's not made for that frequency range). I am not saying I know better than you, I'm just saying that you could get better transmit/receive power if you used the proper antenna.

An idea could be that you could use the antenna that came with the usb device and just desolder it from the board and remove (carefully) the plastic cover on it so the wire(s) are left. Get a pigtail antenna connector from something broken or not used for the mini pcie card and solder it to the antenna the card came with and put it in an empty area of the eee or put it inside the display lid where one of the old wifi antennas was. Your 3g card would last longer, produce less heat, and "get out" much better than a "random" length of wire.

JKK, my mod will use the SW 875U UBS board (for the existing SIM holder), but it will fit any Eee (other the the 8G since the space is used by the SSD)- it will probably use a screen mounted penta-band antenna.

hi, jkk,from the photos, it seemed that the HSDPA Module you used(ZadaCOM 3G+) includes a Mini PCIe module and a USB conversion board, why not use the Mini PCIe module directly? Do the soldering work to use USB interface is more difficult, isn't it?

Hi, great mod. I've got a tablet with an empty pcmcia card slot. there's a usb port just beside it. Do you think i can do the same and throw the hsdpa pcb into the pcmcia slot?

any dis-advantage over getting a pcmcia card? I've one sonyericsson 300 pcmcia card but it sticks out about 1cm from the tablet which is what i don't want. was thinking of making the hsdpa modem internl.... possible? pls share your views and advise.

Very nice mod. I bought Zadako 3G+ usb modem, but the board is different from your photos. No battery, slightly different layout and sierra MC8780 instead MC8775. My problem is I am not able to find + and _ on my board (because there is no battery). Any suggestion ?

I watched video where you were attaching touch screen and it was brilliant but i was thinking abou tthat fingerprint reader. If you disabled the webcam, why dont you put it out and install the fingerprint reader there instead of it?

Jkk Fantastic mod!...Again! I curious to find out could you have left the battery in and used it as the power source for the modem allowing you to save battery life for the rest of th pc?If that mod can be done why not a mod for a second battery or extended battery? power seems to be the future problem with any other mods

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JKK, have you tried to put the modem board directly into the mini pcie slot? I have the connector available just near the RAM and I can acces it from the ram bay (cover). If it diables the ssd why not try to cut te connections on the modem board leaving just the power and usb D+ and D-.Do you think that will work? cause I might just do that. I have a 900 version 20Gb = 4Gb (on main ssd) + 16Gb on removable ssd. I would prefer to have 3g internet rather than 16 Gb cause I plan to mod in some extra flash

In the photos, I see you have the same 'early' version of Asus EeePC 701 model that I have, and I see you have removed the wifi module from its mini-PCIe slot as well. My question is why did you not make use of that slot, rather than using the SSD expansion slot instead? I don't understand this, as the wifi slot doesn't interfere with the boot and already has the correct power available - with BIOS control, even! The only thing that slot is lacking are the 4 USB connections to interface to the Sierra module. So, wouldn't it be better to mount the Sierra module in the wifi slot and run only the USB port wiring to it instead?

I thought it was the other way around. I did try putting the Sierra module (MC5725, taken from an AC595U) in there, and it did seem to power up but I couldn't get a connection going so I thought it was due to the lack of USB connections to that slot. Is it not that the Sierra module is USB-only, but the original wifi is PCIe bus connection instead?

What is the pinout for MC5725? I have searched for a long time on the internet and have even called Sierra directly, but still I cannot find such. Do you know of any place to find the real technical datasheet for it?